Behavioural mixed-signal model1602A HD44780lcd_hd44780
LCD 16×2 / 20×4 (HD44780, parallel)
Text LCD with HD44780 controller: 4- or 8-bit bus (RS, E, D4–D7 is enough), R/W to GND. Contrast via V0: VDD − V0 ≈ 4 V (10 kΩ pot between VDD and GND, wiper to V0) – without suitable contrast the display stays blank. Backlight A/K with a 100 Ω series resistor. Commands during BUSY (37 µs, clear/home 1.52 ms) are lost. Drive with LiquidCrystal.
Key data
- Category
- Modules
- Simulation model
- Behavioural mixed-signal model
- Manufacturer part number
- 1602A HD44780
- Reference prefix
- DS
- Pins
- 16
- Land pattern
- PinHeader_1x16_P2.54mm_Vertical
Simulation model
A behavioural model implements the interface of the chip (registers, protocol, timing) at its pins. The pins are connected to the analog circuit like CMOS pins.
- Model
- lcd_hd44780
- Supply pins
- VDD / VSS
Pins 16
| Pin | Name | Use |
|---|---|---|
| VSS | VSSGround pin | Ground |
| VDD | VDDSupply pin | Supply 5 V |
| V0 | V0Input pin | Contrast: wiper of a 10 kΩ potentiometer between VDD and GND |
| RS | RSInput pin | Register select: command / data |
| RW | RWInput pin | Read/write: tie to GND (write only) |
| E | EInput pin | Enable: falling edge latches the data |
| D0 | D0Input pin | Data bit 0: unused in 4-bit mode |
| D1 | D1Input pin | Data bit 1: unused in 4-bit mode |
| D2 | D2Input pin | Data bit 2: unused in 4-bit mode |
| D3 | D3Input pin | Data bit 3: unused in 4-bit mode |
| D4 | D4Input pin | Data bit 4 (4-bit mode) |
| D5 | D5Input pin | Data bit 5 (4-bit mode) |
| D6 | D6Input pin | Data bit 6 (4-bit mode) |
| D7 | D7Input pin | Data bit 7 (4-bit mode) |
| A | ASupply pin | Backlight anode: through a resistor to 5 V |
| K | KGround pin | Backlight cathode: to GND |
Parameters 1
Format
sizeDefault16x2
16x220x4
PCB
Connector / off-board
PinHeader_1x16_P2.54mm_VerticalLCD module on a 16-pin header (1 VSS, 2 VDD, 3 V0, 4 RS, 5 RW, 6 E, 7–14 D0–D7, 15 A, 16 K)